Brass is a copper alloy with zinc as the main additive […]
Brass is a copper alloy with zinc as the main additive element. It has a beautiful yellow color and is collectively called brass. The copper-zinc binary alloy is called ordinary brass or simple brass. More than three yuan of brass is called special brass or complex brass. Brass alloys containing less than 36% zinc are composed of solid solution and have good cold workability. For example, brass containing 30% zinc is commonly used to make bullet casings, commonly known as cartridge brass or seven-three brass. Brass alloys containing between 36 and 42% zinc are composed of solid solution, the most common of which is 40% brass with 40% zinc. In order to improve the performance of ordinary brass, other elements such as aluminum, nickel, manganese, tin, silicon, lead, etc. are often added. Aluminum can improve the strength, hardness and corrosion resistance of brass, but it reduces the plasticity and is suitable for seawater condensing pipes and other corrosion resistant parts. Tin can improve the strength of brass and the corrosion resistance to seawater, so it is called naval brass, used as ship thermal equipment and propellers. Lead can improve the cutting performance of brass; this free-cutting brass is often used as a watch part. Brass castings are commonly used to make valves and pipe fittings.
Bronze originally refers to copper-tin alloy. Copper alloys other than brass and white copper are called bronze, and often the name of the first major additive element in front of the bronze name. Tin bronze has good casting performance, anti-friction performance and good mechanical properties, and is suitable for manufacturing bearings and worm gears. Lead bronze is a widely used bearing material for modern engines and grinding machines. Aluminum bronze has high strength, good wear resistance and corrosion resistance, and is used for casting high-load gears, bushings, marine propellers, etc. Beryllium bronze and phosphor bronze have high elastic limit and good electrical conductivity, and are suitable for manufacturing precision springs and electrical contact components. Beryllium bronze is also used to manufacture non-sparking tools for coal mines, oil depots and the like.
Copper alloy is a copper alloy with nickel as the main additive element. The copper-nickel binary alloy is called ordinary white copper; the white copper alloy with elements such as manganese, iron, zinc and aluminum is called complex white copper. Industrial white copper is divided into two categories: structural white copper and electrical white copper. Structural white copper is characterized by good mechanical properties and corrosion resistance, and beautiful color. This white copper is widely used in the manufacture of precision machinery, chemical machinery and marine components. Electrical white copper generally has good thermoelectric properties. Manganin, copper, and copper are manganese white copper with different manganese content. They are used in the manufacture of precision electrical instruments, varistors, precision resistors, strain gauges, thermocouples, etc.